as your cycles are irregular it is difficult to predict ovulation,
if at all you traced ovulation with kits, as you had intercourse before and after ovulation,
as there is around 2 to 3% failure rate for condoms,
and as sperms can stay up to 4 to 5 days in female genital tract, ovum can also be viable for 48 hours sometimes there is chance for pregnancy
so you better test for pregnancy once.